Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

all of these
ingestion of bacteria
ingestion of fungi
ingestion of mold

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Microbiology of Soils
Nitrogen fixation

changes the free nitrogen (N2) to a form usable by plants
fix the free nitrogen (N2) by which it should not be usable by plants
especially changes nitrogen compounds, mostly amines such as NH2
both (a) and (b)

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